带肘节式连接耗能减震层的超高层结构抗震性能研究

Research on Seismic Performance of a Super Tall Building with Energy Dissipation Story Containing Toggle Damping Braces

以某299.3m超高层框架-核心筒结构为研究对象,针对该工程的自身特点提出了设置屈曲约束支撑、肘节式和人字形连接黏滞阻尼器的3种耗能减震层控制方案。在8度小震作用下,对比分析了不同控制方案对耗能减震层内力突变的减震控制效果,同时对黏滞阻尼器采用肘节式和人字形两种连接方式的耗能率进行对比分析。结果表明,带肘节式连接减震方案能有效地降低耗能减震层位置处的内力突变,减震层位置剪力墙剪力突变幅值的最大降幅达46.2%,大大降低了加强层构件连接部位应力集中效应,验证了黏滞阻尼器采用肘节式连接比人字形连接具有更高的耗能效果,耗能率最大提高133.1%,证明了带肘节式连接耗能减震层对超高层结构抗震的有效性和可行性。

A 299.3m super tall frame-core tube structure is studied here. According to the characteristics of the project, three control schemes with energy dissipation story are proposed, scheme with buckling restrained brace, scheme with toggle-brace and chevron brace viscous dampers. Comparisons and analysis on damping effect that different control schemes to internal force mutation in energy dissipation story are carried out under 8 degree small earthquake, moreover, the energy consumption rate of viscous damper adopts toggle-brace and chevron brace is compared and analyzed. The results show that, the scheme containing toggle damping brace can reduce internal force mutation in energy dissipation story effectively, the structure shear wall shears mutation amplitude is reduced to 46.2% in strengthened stories, the stress concentration effect in strengthen layer member connecting parts is greatly reduced, the viscous damper that adopts toggle connection has the higher energy dissipation than that adopts chevron connection is verified, the energy dissipation rate is increased by 133. 1% , the validity and feasibility of energy dissipation story containing toggle damping braces to seismic resistance for super high-rise structure are approved.